1. Trace Elements in the Terrestrial Environment;Adriano,1986
2. Trace Elements in Soils;Aubert,1977
3. Geochemical studies of uranium and vanadium in a Swedish alum shale, Stockholm Contri;Armands;Geol.,1972
4. Atkinson, W.J., 1967, Regional geochemical studies in country Limerick, Ireland with particular reference to selenium and molybdenium, Ph.D thesis, University London.
5. Loss-on-ignition as an estimate of organic matter and organic carbon in noncalcareous soil;Ball;J. Soil Sci.,1964